we focus in on one of the most famous scenes from "casablanca." But it's not bogart or bergman drawing the attention. It's something else. Back in the news 70 years after the movie came out. ♪ And man must have his mate that no one can deny ♪ Reporter: It is one of the greatest romantic scenes of all time. May of '42, the flashback to paris. Ingrid bergman and humphrey bogart. The scene in which bergman and bogart are in love. They're having a wonderful time. They're happy. Even though the germans are about to march into paris. It's a glorious moment. Reporter: It was the first scene filmed. They had only met a week before. They would convince all who watched they were madly in love. Right there in front of them, the 58-key piano where sam sings -- ♪ as time goes by ♪ Reporter: And then the famous champagne toast. I think of it as one of the film's stars. Bergman, bogart, and the piano. Reporter: It went on to win three oscars, including best picture. What was unknown is where that iconic piano ended up. It was discovered by a collector many years later. The paint off. Realized it was the piano from the movie. The piano is a revelation when you see it like this. In the movie, it's black and white. And here you can see, actually, it was highly painted. Reporter: Now, 70 years after sharing that scene, the piano on the auction block. I stand here imagining bogart and bergman, and the glasses of champagne. Wilson seated there on the bench. And bogart looking at bergman and saying -- here's looking at you, kid.

This transcript has been automatically generated and may not be 100% accurate.

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